Since 6.5.1.a-2013092302, default 'php-type' is 'php-fpm_event'. As we know, 'mod_php_ruid2' as default 'php-type'.
Impact for this change, we will see 'php-fpm_event' as 'php-type' in 'webserver config' after fresh install.
Also, this change for prepare 'multiple php' instead 'primary-secondary php' in previous version.